Method of forming bolt-nuts.



W. E. SHARP.

METHOD OF FORMING BOLT NUTS.

APPLICATION FILED MAR.5.19I4.

Patented Sept. 21,

-WILLIAM E. SHARP, OF CHICAGO, ILLINOIS, ASSIGNOR 'I'O'. GRIP NUT COMPANY CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

METHOD or romaine BOLT-NUTS.

Specification of Letters Patent.

Patented Sept. 21, 1915.

Original application filed November 8, 1913, Serial No. 799,868. 'mv'iaea and this application filed March a,

. 1914. Serial No. 822,592. 1

To all whom it may concern:

Be it known that I, WILLIAM E. SHARP, a citizen of the United States, residing at Chicago, in thecounty of Cook and State of Illinois,'ha-ve invented certain new and use-.

ful Improvements in Methods of Forming Bolt-Nuts, of which the following is a description. v 1 This application is a division of an appllcation heretofore filed by me on November 8, 1913, Serial Number799,868.

My invention is particularly adapted to produce what is generally termed grip nuts, in which the nut is so formed as to engage the bolt in a manner which tends to prevent the accidental disengagement of the nut from the bolt, as by backing ofi' caused by shocks or arring of the parts.

To this end my invention consists in the novel method of forming the nut more fully described herein, and particularly pointed out in the claims. a

In the drawings, wherein like reference characters indicate like or corresponding parts, Figure 1 is a side elevation of a swaging mandrel employed in connection with my invention, and Fig. 2 1s a transverse section through a nut, formed with the aid ofsaid mandrel.

The parts are exaggerated as shown in the drawings to more clearly illustrate the invention.

As shown in the drawings, 1 is. a swaging mandrel which is suitably hardened to accomplish the purpose for which it is constructed. The advancing end of the mandrel as at bb may, if desired, be formed with a standard thread, with which the regularly threaded nut will readily engage. Thisis provided for a lead for the following part of the swage until the latter is suitab y and firmly engaged with the nut to secure proper swaging action. The said advancing end-is may be termed abnormal, meaning a slight modification of either the thread or the helix of the nut. Asshown in the drawings, the inclination or itch of the thread is swaged slightly out o the normal. The nut, after being cut in the usual manner, is threadedupon the mandrel and forced thereon, pref the nut is entered'by the mandrelin forming the nut, and the mandrel may enter from the side on whichthe tapper tap was first engaged with the nut, or from the opposite side thereof, suitable mechanism being. employed to accomplish this purpose. Thus the tapper tap may cut the nut in the usual the mechanism may cause the mandrel to enter the nut from the opposite side, engaging with and led by the threads thus cut, and forcing its way into the nut until it has swa'ged a portion of the threads slightly out of the standard form or pitch.-

It will be. seen that no further cutting is done, and that the form or pitch, or if preferred, both, may be modified as described. The swaging being gradual, the lead provided by the loosely fitting advancing end of the swage may, in some cases, be practically omitted with good results. i

The nut thus formed will bind upon and frictionally engage a suitable bolt, with sufficient grip to prevent accidental disengagement therefrom, and requiring a suitable wrench or tool to disconnect the parts.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: p

The method of forming a bolt nut, consisting in preparing -a swaging mandrel,

normal standard thread on the nut, and anmanner, and as it is withdrawn therefrom,

other section thereof varying therefrom, and

forcing a nut on said mandrel to a. point signed my name in the presence of two subwhen;i 0a part of hehni1t is gomied ufimnbsaid scribing Witnesses. modi e art 0 t e man re w ere a section of the threaded portion hf the nu is SHARP 5 norn1a1,.and another section thereof varies Witnesses:

therefrom. W. C. C0011,

In testimony whereof, I have hereunto CHARLES I. Conn. 

